Citric Acid Anhydrous

Cas Number


Other Names

Citric acid

The formula



Citric acid is a weak organic tricarboxylic acid having the chemical formula C6H8O7. It occurs naturally in citrus fruits. The monohydrate can be converted to the anhydrous form at about 78 °C. Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 °C. It decomposes with loss of carbon dioxide above about 175 °C.

Physical and Chemical Properties
Molar mass 192.12 g·mol−1
Appearance crystalline white solid
Odor odorless
Density 1.665 g/cm3 (anhydrous), 1.542 g/cm3 (18 °C, monohydrate)
Melting point 156 °C (313 °F; 429 K)
Boiling point 310 °C (590 °F; 583 K) decomposes from 175 °C[1]
Solubility in water 117.43 g/100 mL (10 °C), 147.76 g/100 mL (20 °C), 180.89 g/100 mL (30 °C), 220.19 g/100 mL (40 °C), 382.48 g/100 mL (80 °C), 547.79 g/100 mL (100 °C)[2]
Solubility soluble in alcohol, ether, ethyl acetate, DMSO, insoluble in C, 6H, 6, CHCl3, CS2, toluene[1]
Solubility in ethanol 62 g/100 g (25 °C)[1]
Solubility in amyl acetate 4.41 g/100 g (25 °C)[1]
Solubility in diethyl ether 1.05 g/100 g (25 °C)[1]
Solubility in 1,4-Dioxane 35.9 g/100 g (25 °C)[1]
log P −1.64
Acidity (pKa) pKa1 = 3.13[3]
pKa2 = 4.76[3]
pKa3 = 6.39,[4] 6.40[5]
Refractive index (nD) 1.493–1.509 (20 °C)[2]
1.46 (150 °C)[1]
Viscosity 6.5 cP (50% aq. sol.)[2]

1. In Food Production Citric Acid Anhydrous can be used as acidity regulator and preservative in food such as in Baby Food, Infant Formula, Bakery, Cereals, Snacks, Confectionery, Dairy, Desserts, Ice Cream, Flavours, Fruit Preparations, Sweet Spreads, Fruits, Vegetables, Meat, Seafood, Ready Meals, Instant Food, Sauces, Dressings, Seasonings.

2. In Beverage Citric Acid Anhydrous can be used as acidity regulator and antioxidant in beverage such as in Alcoholic Beverages, Carbonated Soft Drinks, Instant Drinks, Syrups, Juice Drinks, RTD Tea and Coffee, Sports and Energy Drinks, Waters.

3. In Pharmaceutical Citric Acid Anhydrous can be used as thrombin inhibitor and fungicide in Pharmaceutical.

4. In Health and Personal care Citric Acid Anhydrous can be used as exfoliating agent and antioxidant in Cosmetics and personal care products such as in Colour Cosmetics, Deodorants, Fragrances, Hair Care, Oral Care, Skin Care, Soap and Bath Products.

5.In Agriculture/Animal Feed/Poultry Citric Acid Anhydrous E330 can be used as antioxidant and ph regulator in Agriculture/Animal Feed/Poultry feed.

6.In Other Industries Citric Acid Anhydrous E330 can be used in chemical cleaning, concrete admixtures, plasticizers, and a range of other applications.